One thing to note is that the basic Roamio does not have MoCa built in. You don't say which TiVo you plan to pair the Minis to, but if it's a basic Roamio then you'll need a MoCa adapter somewhere on your network for the MoCa Mini to work. If you have a 4 tuner Premiere or a 6 tuner Roamio then those have MoCa built in and your setup will work fine provided the TiVo is connected to Ethernet. (the TiVo will act as a Ethernet/MoCa bridge)